header {
  padding: 10px;
  /* width: 100%; */
  display: flex;
  flex-direction: row;
  gap: 10px;
}
h1 {
  flex: 1;
  margin: 0;
}

header > button {
  aspect-ratio: 2;
}

main {
  padding: 10%;
  min-height: 90vh;
  flex-direction: column;
  display: flex;
  align-content: center;
  align-items: center;
}

body {
  margin: 0;
}